Demographic information form, vestibular tests, balance tests will be used in the evaluation. The demographic information form includes demographic information (name, surname, gender, smoking, alcohol use, etc.) and clinical conditions (past illnesses and/or surgeries, medications used, whether there is a history of falls, if any, frequency, whether they are afraid of heights and uncomfortable in the dark, etc.). The patients will be diagnosed with videonystagmography (VNG) after the decision of the ENT physician, and their hypofunction levels will be recorded. Vestibular and balance tests will be applied to the patients in the clinical setting. At the end of the study, it will be examined whether there is a relationship between the degree of vestibular hypofunction and the vestibular tests applied in the clinic.

This form will ask questions about the patient's age, gender, occupation, whether or not they smoke or drink alcohol, accompanying illnesses, previous surgeries, medications they use, daily activity level, history of the disease, onset and type of the disease, whether or not they have fallen in the last year and if so, how many falls, fear of heights, fear of darkness and discomfort with crowds.

It is a test that shows which labyrinth is affected and cannot function in peripheral vestibular diseases. The patient makes a counting movement in place 50 times with his eyes closed. If there is a deviation of 45 degrees or more to the right or left after the counting movement, this gives us information that the labyrinth on that side cannot function.

It is the situation where the visual event is realized clearly while moving. The test is started by passively moving the patient's head in the horizontal plane with a 20° amplitude and 2 Hz speed and the patient starts reading the letters on the Snellen card. The line that can be seen clearly is recorded. The dynamic visual acuity score is the difference between the number of lines on the visual graph when the head is moving passively against the stationary head. In healthy individuals, visual acuity may change by one line in young individuals and by two lines in older individuals. In uncompensated patients, the degree of visual acuity may change by three or two lines in unilateral vestibular losses.

It is a test used to evaluate the function of the vestibulo-ocular reflex (VOR). The head thrust test can be applied in all planes of the semicircular canals. The patient sits on a chair. The physiotherapist or the practitioner stands in front of the patient. The patient is asked to focus on his nose and the patient's head is held and the head is rotated in a horizontal plane with low amplitude and high acceleration. The patient's ability to keep his eyes fixed on the practitioner's nose indicates that there is no problem in the VOR, while corrective saccadic movement indicates that the test is positive.